/****************************************************************************
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 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** No Commercial Usage
 ** This file contains pre-release code and may not be distributed.
 ** You may use this file in accordance with the terms and conditions
 ** contained in the Technology Preview License Agreement accompanying
 ** this package.
 **
 ** GNU Lesser General Public License Usage
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 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
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#ifndef FULLSCREENEXITBUTTON_H
#define FULLSCREENEXITBUTTON_H

#include <QtGui/qtoolbutton.h>
#include <QtGui/qevent.h>

class FullScreenExitButton : public QToolButton
{
  Q_OBJECT
public:
  inline explicit FullScreenExitButton(QWidget *parent);

protected:
  inline bool eventFilter(QObject *obj, QEvent *ev);
};

FullScreenExitButton::FullScreenExitButton(QWidget *parent)
  : QToolButton(parent)
{
  Q_ASSERT(parent);
#ifdef Q_WS_MAEMO_5
  // set the fullsize icon from Maemo's theme
  setIcon(QIcon::fromTheme(QLatin1String("general_fullsize")));
#endif
  // ensure that our size is fixed to our ideal size
  setFixedSize(sizeHint());

  // set the background to 0.5 alpha
  QPalette pal = palette();
  QColor backgroundColor = pal.color(backgroundRole());
  backgroundColor.setAlpha(128);
  pal.setColor(backgroundRole(), backgroundColor);
  setPalette(pal);

  // ensure that we're painting our background
  setAutoFillBackground(true);

  // when we're clicked, tell the parent to exit fullscreen
  connect(this, SIGNAL(clicked()), parent, SLOT(slotFullscreenExit()));

  // install an event filter to listen for the parent's events
  parent->installEventFilter(this);
}

bool FullScreenExitButton::eventFilter(QObject *obj, QEvent *ev)
{
  if (obj != parent())
    return QToolButton::eventFilter(obj, ev);

  QWidget *parent = parentWidget();
  bool isFullScreen = parent->windowState() & Qt::WindowFullScreen;

  switch (ev->type()) {
  case QEvent::WindowStateChange:
    setVisible(isFullScreen);
    if (isFullScreen)
      raise();
    // fall through
  case QEvent::Resize:
    if (isVisible())
      move(parent->width() - width(),
           parent->height() - height());
    break;
  default:
    break;
  }

  return QToolButton::eventFilter(obj, ev);
}

#endif
